So what? Its not that they are going to burn 400W 24/7 the year around.
And still half the year I will have the heat inside the house.
The fact remains that cool boxes with peltiers work. Exactly the same thing.
And well, its cheaper to buy the beer in cases of 24.

But as a defence, I dont have the space for another refrigerator in my livingroom, and build this with a compressor from an old fridge was not an option. Its not cost efficiant.

With this said, I dont care if its expensive to run my fridge as long as I cold beer. And I built it myself!

And I'd like to see my 1.080 beers ready from grain to glass in a week, and served to me by red-headed twin penthouse pets wearing garter belts and fishnet stockings, with Irish accents, calling me "master luv gun," but we can't always get what we want can we? :)